It carries an auxiliary fuel-cell generator in the pickup bed that the Army will use to power communications equipment.

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The generator could even be a hydrogen fuel cell.

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So the fuel cell can be used to act almost as a back up generator.

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Taking to Crowd Supply for funding, Gridcase's Reactor features an internal 400mAh battery and a crank-powered 500mAh generator that allows users to manually distribute power to their phone's fading cell.

ENGADGET

The Volt's gasoline generator is mechanically independent of the wheels--easily swapped in the future for ethanol, biodiesel or fuel cell generators.

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